Class Racer Info

Tim H · 05-18-2018, 12:51 PM

Using the very helpful site that Dwight has provided, I have a question regarding piston compression height. As an example one of the listed repl. pistons for a 1969 Chevy 350/300 is the TRW L2256F. TRW lists the compression height @ 1.563 " however the NHRA tech spec is 1.535". I am missing something ?

Race Clean · 05-18-2018, 02:37 PM

No,only that you are good by .002 on that part of the side
You can still get the desired Deck clearance!

jmantle · 05-21-2018, 04:56 PM

Quote:

Originally Posted by Tim H

Using the very helpful site that Dwight has provided, I have a question regarding piston compression height. As an example one of the listed repl. pistons for a 1969 Chevy 350/300 is the TRW L2256F. TRW lists the compression height @ 1.563 " however the NHRA tech spec is 1.535". I am missing something ?

NHRA lists the minimum accepted pin height. Most replacement pistons will exceed this dimension but still give you room to deck the block.

Jim Mantle V/SA 6632

05-18-2018, 12:51 PM	#1
Tim H VIP Member Join Date: Jan 2007 Posts: 1,039 Likes: 1,062 Liked 481 Times in 158 Posts	Class Racer Info Using the very helpful site that Dwight has provided, I have a question regarding piston compression height. As an example one of the listed repl. pistons for a 1969 Chevy 350/300 is the TRW L2256F. TRW lists the compression height @ 1.563 " however the NHRA tech spec is 1.535". I am missing something ?

05-18-2018, 02:37 PM	#2
Race Clean Member Join Date: Aug 2017 Posts: 159 Likes: 18 Liked 129 Times in 53 Posts	Re: Class Racer Info No,only that you are good by .002 on that part of the side You can still get the desired Deck clearance! Last edited by Race Clean; 05-18-2018 at 02:41 PM.